Study on Structure and Control Strategy of Hybrid AC / DC Power Grid

Hybrid AC/DC power grid is the development direction and inevitable choice of the future power transmission and distribution network along with the high proportion penetration of distribution generation (DG). The design principle of hybrid AC/DC power grid structure is studied and a novel hybrid AC/DC power grid network structure which combined power electronic transformer (PET) with traditional transformer was proposed to reach the goal of flexible regulation under stable operating conditions. The corresponding control strategy of the proposed grid was designed based on the master-slave control and peer-to-peer control. The correctness of the proposed hybrid AC/DC power grid and the rationality of the control strategies are verified according to the simulation under the PSCAD/EMTDC simulation environment. (paper)